#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using pii = pair<int, int>;
#define rep(i, a, b) for (int i = (a); i <= (b); i++)
#define per(i, a, b) for (int i = (a); i >= (b); i--)
#define endl '\n'
const int N = 2e5 + 5;

ll n, m, x, y, L;
ll extgcd(ll a, ll b, ll& x, ll& y) {
  if (b == 0) {
    x = 1, y = 0;
    return a;
  }
  ll d = extgcd(b, a % b, y, x);
  y -= a / b * x;
  return d;
}
int main() {
  ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
  cin >> x >> y >> m >> n >> L;
  if (m < n) swap(m, n), swap(x, y);
  ll a = m - n;
  ll b = (L + y - x) % L;
  ll d = extgcd(a, L, x, y);
  if (b % d != 0) {
    cout << "Impossible";
    return 0;
  }
  a /= d, L /= d;
  x *= b / d, y *= b / d;
  // a * x + L * y = b / d;
  x %= L;
  if (x < 0) x += L;
  cout << x;
  return 0;
}